The deck crew was changing out cutting skips. A full skip had just been landed and unhooked from the whip line of the starboard crane. As the crane was booming into position for the next lift, the J-latch (Fig.1) from the main block’s hook fell approximately 40 meters and landed on top of the cuttings skid, then bounced between two employees and came to rest on the main deck. No injuries or other damage occurred. The incident was designated “High Potential” for severe injury.